When Covid-19 hit, Gilead Sciences Inc. had enough of its experimental drug remdesivir ready to test and start manufacturing it at a larger scale. That's because it had started stockpiling not just the drug, but its ingredients, at the first hint there may be a new coronavirus. Robert Langreth reports on why the company was able to act early to prepare for a pandemic when so many businesses and institutions did not.See omnystudio.com/listener for privacy information.